[Volume and electrolyte disturbances in endurance sport]

Long-lasting endurance exercise is associated with significant losses of fluid and sodium chloride, mainly due to sweat loss. To maintain endurance capacity and to avoid negative health consequences, endurance athletes should, therefore, drink fluids containing electrolytes during and after training or competition. In long-lasting endurance exercise it is recommended that athletes drink about 600-800 ml/h of fluid including adequate substitution of sodium. The excessive ingestion of fluid, however, brings about a danger of hyponatremia, which can be avoided by suitable measures. Body weight control is one of the parameters that should be carefully monitored before and after intensive endurance exercise.